Bennett's fracture, right hand, subs for fx w nonunion

This code signifies a fracture at the base of the first metacarpal bone (thumb) on the right hand, specifically a Bennett's fracture. The "nonunion" indicates that the bone fragments have failed to heal together after a typical healing period, and the "subsequent encounter" specifies that this is not the initial treatment for the fracture.

Use this code when documenting follow-up care for a patient whose right thumb Bennett's fracture has not healed properly, leading to a nonunion. This applies to situations where the patient is receiving ongoing treatment, evaluation, or management for the unhealed fracture, such as considering revision surgery or other interventions for nonunion.

• Ensure documentation clearly states "right hand" and "Bennett's fracture" along with evidence of nonunion.
• Verify that this is a subsequent encounter, not the initial treatment or a sequela (late effect).
• Always sequence this code with an external cause code if the cause of the original fracture is known and relevant to the current encounter.